Add store id to order item

[ihor-sviziev]

Description (*)

We noticed that the store ID field needs to be filled correctly for the order item objects. As a result, some of our integrations with Magento are having issues processing orders that the Meta extension pulls. This change fixes this misbehavior. Unfortunately, it won't fix the previous data, but will help for newly synced orders.

Story

Bug

Task

Fixed Issues (if relevant)

1. magento-commerce/facebook-for-magento2#: Issue title

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Checklist

• [ ] Pull request has a meaningful description of its purpose
• [ ] All commits are accompanied by meaningful commit messages
• [ ] All new or changed code is covered with unit/integration tests (if applicable)
• [ ] All automated tests passed successfully (all builds are green)

[ihor-sviziev]

@zlik pls review

[zlik]

Merged through a private repo (don't have write permission to this one), thank you for your contribution @ihor-sviziev!